Packets with incorrect checksums are discarded within the network stack, and eventually get retransmitted using ARQ, either explicitly(such as through triple-ack) or implicitly due to a timeout.
ERROR_TIMEOUT(-2),那么有可能存在连接错误。
ERROR_TIMEOUT(-2), there is probably a connection error.
CURLE_FTP_ACCEPT_TIMEOUT(12) During an active FTP session while waiting for the server to connect, the CURLOPT_ACCEPTTIMEOUT_MS (or the internal default) timeout expired.
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